#!/bin/bash
#Filename: image_help.sh
#Description: A script for image management

if [ $# -ne 4 -a $# -ne 6 -a $# -ne 8 ];
then
  echo Incorrect number of arguments
  exit 2
fi

while [ $# -ne 0 ];
do

  case $1 in
  -source) shift; source_dir=$1 ; shift ;;
  -scale) shift; scale=$1 ; shift ;;
  -percent) shift; percent=$1 ; shift ;;
  -dest) shift ; dest_dir=$1 ; shift ;;
  -ext) shift ; ext=$1 ; shift ;;
  *) echo Wrong parameters; exit 2 ;;
  esac;

done



for img in `echo $source_dir/*` ;
do
  source_file=$img
  if [[ -n $ext ]];
  then
    dest_file=${img%.*}.$ext
  else
    dest_file=$img
  fi
  
  if [[ -n $dest_dir ]];
  then
    dest_file=${dest_file##*/}
    dest_file="$dest_dir/$dest_file"
  fi

  if [[ -n $scale ]];
  then
    PARAM="-resize $scale"
  elif [[ -n $percent ]];
  then
    PARAM="-resize $percent%"   
  fi

  echo Processing file : $source_file
  convert $source_file $PARAM $dest_file

done